160.230 is the strongest signal I've gotten and is quite active. I also think I heard 160.785 awhile back, but reception was scratchy. I think both are probably CSX. Let us know if you find any others.

Here is a list of all CSX frequencies in the state and the various territories.

160.590 (32) - Mostly ACL territory
161.100 (66) - Mostly SAL territory.
161.370 (84) - Was L&N territory, but Used all over.
There are many variables to the territories where these channels are used.
161.100 is also used on the EX-ACL Tampa-Bradenton line and 161.370 is used on the ex-SAL Grand Jct-Yulee line in Jax.